Dr. Tantillo, who has a marketing and branding blog ( http://blog.marketingdoctor.tv ), argued against the notion of a joint Obama-Clinton ticket back in May:

“Because of the length of this primary fight, brand identity and loyalty to brand have become central. What this means is that a kind of brand mutual exclusivity has set in. The Obama brand stands for something that the Hillary brand does not. And vice versa!”
Tantillo’s full post on Obama-Clinton joint ticket proposal: http://blog.marketingdoctor.tv/2008/05/14/marketing-101joint-ticket-makes-little-branding-sense.aspx

But at this stage–especially with all that Clinton did in the general election phase to help get Obama elected– I think that the Clinton brand has shifted enough that it would make smart branding sense (for Obama and Clinton but especially for the Democratic Party) for Obama to give give Clinton and Clintonites a role in the new administration.

Tantillo’s recent post on Obama as president-elect: http://blog.marketingdoctor.tv/2008/11/09/brand-winners-barack-obama–retail.aspx